Sleeping Mountain Lion will not wake up

I have just update to Mountain Lion on my 27inch iMac .
Once it goes to sleep automatcially it will not wake up again. I need to press the power button and reboot the whole system which loses any work I am doing
There was no problem with Lion. The machine would wake up via the mouse click or enter on the keyboard
Has anyone else experience this problem and is ther a setting that neds to be changed somewhere

I suspect now that some widgets, and apps are setting bad hibernatemodes.
source: https://discussions.apple.com/message/19066192#19066192#19066192
I used pmset -g, and it said I was in hibernatemode 5. I set this (sudo pmset -a hibernatemode 0) closed the lid, and it came back up. I set it to 3, and the same. I moved over to my widget, and set it. Checked my mode, and it was back to 5.
I used `man pmset` it said to only use mode 0, 3, and 25! No others! I again set it (sudo pmset -a hibernatemode 25) this time to 25, and it seems to work fine.
I suspect Apple made changes to their power managment, and disabled older modes. They should have set this correctly in our upgrades, instead of letting us figure it out.
[repost from: https://discussions.apple.com/message/19062891?ac_cid=op123456#19062891?ac_cid=o p123456]

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